<template>
	<div>
		<!-- 面包屑导航 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>
		<!--卡片视图区域  -->
		<el-card>
			<!-- 头部警告区域 -->
			<el-alert
				title="注意：只允许为第三级分类设置相关参数！"
				type="warning"
				:closable="false"
				show-icon
			></el-alert>
			<!-- 选择商品分类区 -->
			<el-row class="cat_opt">
				<span>选择商品分类：</span>
				<!-- 选择商品分类的级联框 -->
				<el-cascader
					expand-trigger="hover"
					:options="catelist"
					:props="cateProps"
					v-model="selectedCateKeys"
					clearable
					change-on-select>
				</el-cascader>
			</el-row>
			<!-- tabs页签区域 -->
			<el-tabs v-model="activeName" @tab-click="handleTabClick">
				<!-- 添加动态参数的面板 -->
				<el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button
						type="primary"
						size="mini"
						:disabled="isBtnDsiabled"
						@click="addDialogVisible = true"
						>添加参数</el-button>
					<!-- 动态参数的表格 -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染tag标签 -->
								<el-tag
									v-for="(item, i) in scope.row.attr_vals"
									:key="i"
									closable
                                    @close="handlevClose(i,scope.row)"
									>{{ item }}</el-tag>
								<!-- 输入的文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									ref="saveTagInput"
									size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)"
									@blur="handleInputConfirm(scope.row)"
								>
								</el-input>
                                <!-- 添加按钮 -->
								<el-button
									v-else
									class="button-new-tag"
									size="small"
									@click="showInput(scope.row)"
									>+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column
							label="参数名称"
							prop="attr_name"
						></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button
									type="primary"
									icon="el-icon-edit"
									size="mini"
									@click="showEditDialog(scope.row.attr_id)"
									>编辑</el-button
								>
								<el-button
									type="danger"
									icon="el-icon-delete"
									size="mini"
									@click="removeParams(scope.row.attr_id)"
									>删除</el-button
								>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
				<!-- 添加静态属性的面板 -->
				<el-tab-pane label="静态属性" name="only">
					<el-button
						type="primary"
						size="mini"
						:disabled="isBtnDsiabled"
						@click="addDialogVisible = true"
						>添加属性</el-button
					>
					<!-- 静态参数表格 -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scope="scope">
								<!-- 循环渲染tag标签 -->
								<el-tag
									v-for="(item, i) in scope.row.attr_vals"
									:key="i"
									closable
                                    @close="handlevClose(i,scope.row)"
									>{{ item }}</el-tag>
								<!-- 输入的文本框 -->
								<el-input
									class="input-new-tag"
									v-if="scope.row.inputVisible"
									v-model="scope.row.inputValue"
									ref="saveTagInput"
									size="small"
									@keyup.enter.native="handleInputConfirm(scope.row)"
									@blur="handleInputConfirm(scope.row)"
								>
								</el-input>
                                <!-- 添加按钮 -->
								<el-button
									v-else
									class="button-new-tag"
									size="small"
									@click="showInput(scope.row)"
									>+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column
							label="属性名称"
							prop="attr_name"
						></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button
									type="primary"
									icon="el-icon-edit"
									size="mini"
									@click="showEditDialog(scope.row.attr_id)"
									>编辑</el-button
								>
								<el-button
									type="danger"
									icon="el-icon-delete"
									size="mini"
									@click="removeParams(scope.row.attr_id)"
									>删除</el-button
								>
							</template>
						</el-table-column>
					</el-table>
				</el-tab-pane>
			</el-tabs>
		</el-card>
		<!-- 添加参数的对话框 -->
		<el-dialog
			:title="'添加' + titleText"
			:visible.sync="addDialogVisible"
			width="50%"
			@close="addDialogClosed"
		>
			<!-- 添加参数的对话框 -->
			<el-form
				ref="addFormRef"
				:model="addForm"
				:rules="addFormRules"
				label-width="100px"
			>
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="addForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="addDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="addParams">确 定</el-button>
			</span>
		</el-dialog>

		<!-- 修改参数的对话框 -->
		<el-dialog
			:title="'修改' + titleText"
			:visible.sync="editDialogVisible"
			width="50%"
			@close="editDialogClosed"
		>
			<!-- 添加参数的对话框 -->
			<el-form
				:model="editForm"
				:rules="editFormRules"
				ref="editFormRef"
				label-width="100px"
			>
				<el-form-item :label="titleText" prop="attr_name">
					<el-input v-model="editForm.attr_name"></el-input>
				</el-form-item>
			</el-form>
			<span slot="footer" class="dialog-footer">
				<el-button @click="editDialogVisible = false">取 消</el-button>
				<el-button type="primary" @click="editParams">确 定</el-button>
			</span>
		</el-dialog>
	</div>
</template>

<script>
export default {
	data() {
		return {
			catelist: [],
			// 级联选择框的配置对象
			cateProps: {
				value: 'cat_id',
				label: 'cat_name',
				// 通过children来连接父子节点
				children: 'children'
			},
			// 级联选择框双向绑定到的数组
			selectedCateKeys: [],
			// 被激活的页签名称(默认显示页签)
			activeName: 'many',
			// 动态参数的数据
			manyTableData: [],
			// 静态属性的数据
			onlyTableData: [],
			// 控制添加对话框的显示与隐藏
			addDialogVisible: false,
			// 添加参数的表单数据对象
			addForm: {
				attr_name: ''
			},
			// 添加表单的验证规则对象
			addFormRules: {
				attr_name: [
					{
						required: true,
						message: '请输入参数名称',
						trigger: 'blur'
					}
				]
			},
			// 控制修改对话框的显示与隐藏
			editDialogVisible: false,
			// 修改的表单数据对象
			editForm: {},
			// 修改表单的验证对象
			editFormRules: {
				attr_name: [
					{
						required: true,
						message: '请输入参数名称',
						trigger: 'blur'
					}
				]
            }
		}
	},
	created() {
		this.getCateList()
	},
	methods: {
		// 获取所有的商品分类
		async getCateList() {
			const { data: res } = await this.$http.get('categories')
			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类失败！')
			}
			this.catelist = res.data
			console.log(this.catelist)
		},
		// 级联选择框选中项变化会触发该函数
		handleChange() {
			this.getParamsData()
		},
		// tab页签点击事件的处理函数
		handleTabClick() {
			console.log(this.activeName)
			this.getParamsData()
		},
		// 获取参数的列表数据
		async getParamsData() {
			// 证明选中的不是三级分类
			if (this.selectedCateKeys.length !== 3) {
                // 清空数组
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
			}
			// 证明选中的是三级分类
			// console.log(this.selectedCateKeys);
			// 根据所选分类的 id，和当前所处的面板，获取对应的参数
			const {
				data: res
			} = await this.$http.get(`categories/${this.cateId}/attributes`, {
				params: { sel: this.activeName }
			})
			// 报错
			if (res.meta.status !== 200) {
				return this.$message.error('获取参数列表失败！')
			}
			// 循环字符串
			res.data.forEach((item) => {
				// 如果value值不为空则直接分割，如果为空直接返回空白数组
                item.attr_vals = item.attr_vals ? item.attr_vals.split('') : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
			})
			console.log(res.data)
			if (this.activeName === 'many') {
				this.manyTableData = res.data
			} else {
				this.onlyTableData = res.data
			}
		},
		// 监听关闭对话框事件
		addDialogClosed() {
			// 重置表单框
			this.$refs.addFormRef.resetFields()
		},
		// 点击按钮添加参数
		addParams() {
			this.$refs.addFormRef.validate(async (valid) => {
				if (!valid) return
				const { data: res } = await this.$http.post(
					`categories/${this.cateId}/attributes`,
					{
						attr_name: this.addForm.attr_name,
						attr_sel: this.activeName
					}
				)
				if (res.meta.status !== 201) {
					return this.$message.error('添加参数失败！')
				}
				this.$message.success('添加参数成功！')
				this.addDialogVisible = false
				this.getParamsData()
			})
		},
		// 点击按钮展示修改的对话框
		async showEditDialog(attr_id) {
			// 查询当前参数信息
			const { data: res } = await this.$http.get(
				`categories/${this.cateId}/attributes/${attr_id}`,
				{
					params: { attr_sel: this.activeName }
				}
			)
			if (res.meta.status !== 200) {
				return this.$message.error('获取参数信息失败！')
			}
			// 如果没有错误就赋值到editForm
			this.editForm = res.data
			this.editDialogVisible = true
		},
		// 重置修改的表单
		editDialogClosed() {
			this.$refs.editFormRef.resetFields()
		},
		// 点击按钮修改参数信息
		editParams() {
			this.$refs.editFormRef.validate(async (valid) => {
				if (!valid) return
				const { data: res } = await this.$http.put(
					`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
					{
						attr_name: this.editForm.attr_name,
						attr_sel: this.activeName
					}
				)
				if (res.meta.status !== 200) {
					return this.$message.error('修改参数失败！')
				}
				this.$message.success('修改参数成功！')
				this.getParamsData()
				this.editDialogVisible = false
			})
		},
		// 根据 id 删除参数
		async removeParams(attr_id) {
			const confirmResult = await this.$confirm(
				'此操作将永久删除该参数, 是否继续?',
				'提示',
				{
					confirmButtonText: '确定',
					cancelButtonText: '取消',
					type: 'warning'
				}
			).catch((err) => err)
			// 用户取消了操作
			if (confirmResult !== 'confirm') {
				return this.$message.info('已取消删除')
			}
			// 删除的逻辑
			const { data: res } = await this.$http.delete(
				`categories/${this.cateId}/attributes/${attr_id}`
			)
			if (res.meta.status !== 200) {
				return this.$message.error('删除参数失败！')
			}
			this.$message.success('删除参数成功！')
			this.getParamsData()
        },
        // 文本框失去焦点或按下了enter都会触发
        async handleInputConfirm(row) {
            // console.log('ok');
            // 如果文本框没有空格的长度为 则返回
            if (row.inputVisible.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 如果没有 return ，则证明输入的内容，需要做后续处理
            // 把新添加的数据推到数据库中
            row.attr_vals.push(row.inputVisible.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
        },
        // 将对attr_vals 的操作，保存到数据库
        async saveAttrVals(row) {
            // 需要发起请求保存这一次操作
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join('')
            })
            if (res.meta.status !== 200){
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        // 点击按钮 展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获得焦点
            // nextTick方法：就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handlevClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
	},
	// 计算属性
	computed: {
		// 如果按钮需要被禁用则返回 true，反之返回 false
		isBtnDsiabled() {
			if (this.selectedCateKeys.length !== 3) {
				return true
			}
			return false
		},
		// 当前选中的三级分类的 id
		cateId() {
			if (this.selectedCateKeys.length === 3) {
				// 返回第二项
				return this.selectedCateKeys[2]
			}
			// 如果没有三级 id 就返回空值
			return null
		},
		// 动态计算标题的文本
		titleText() {
			if (this.activeName === 'many') {
				return '动态参数'
			}
			return '静态属性'
		}
	}
}
</script>

<style lang="less" scoped>
// 添加间距
.cat_opt {
	margin: 15px 0;
}
.el-tag {
	margin: 5px;
}
.input-new-tag {
    width: 120px;
}
</style>
